The group, called Y Not 2017 Survivors, was set up on Tuesday - and by this morning it had topped the 600 member mark.

Hundreds of tents were abandoned after the Y Not Festival at Pikehall in Derbyshire (Image: Steven Pentleton – www.HawkUAV.co.uk)

The page's administrator Chris Garlick said: “I can honestly say I have never seen such a mass outpouring of shocked, indignant frustration and anger as I have seen from those who have joined the group.

“The group has revealed so many stories in common - tales of robberies, frightened children, untrained, rude and aggressive stewards, freely available drugs; and people suffering due to totally inadequate provision of water, lighting, toilets, chemical waste disposal, bins, or safe ground covering in key pinch-points and walkways, nor in the arena itself.”

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He added: “The group has revealed a litany of broken promises and as far as we are concerned, the safety and security of tens of thousands of people was utterly compromised - and only luck prevented a major incident.”

He called for a full apology to be issued and said people should be compensated.

The organisers of the festival said on Tuesday that “refunds are their number one priority” and they are discussing the situation with insurers. No further update has been given since.

Despite the mud, lots of people had a good time at the Y Not Festival (Image: Adam Burzynski)

Responding to criticism from visitors, production manager Jon Drape said: “We were extremely well prepared for the festival this year. We increased spend by 30% on last year’s event and invested heavily in infrastructure, including trackway, traffic management, on-site staff, water, toilets and washing facilities and we had an enhanced police presence.

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"Unfortunately, due to the extreme weather conditions throughout the weekend, it was very difficult to service the site to the level that we wanted and we had to take the difficult decision to cancel the final day of the festival.

“We share our guests’ frustration and disappointment but ultimately the safety of our guests, performers and crew was our primary concern and the potential risk was too severe for the event to carry on.

“We understand that people will want to know about refunds, we will be letting all our guests know further information about this in the coming days.”